Historical clue formulations

• :50 — 2015-01-19
• :50 — 2014-12-30
• 12:50 or 1:50 — 2010-06-22
• Near the hour — 2010-01-23
• Close to the hour — 2009-01-01
• :50 — 2008-10-21
• A little before the hour — 2007-06-26
• Nearly an hour? — 2002-06-01
• 6:50, say — 2002-01-20
• :50 — 1995-09-24